First of all: great game! The atmosphere is tense, there seems to be mystery around every corner and it just keeps you drawn in.
I think I have encountered a bug tho. I was walking around exploring the place when suddenly I got enclosed by walls. Tried to wait for maybe water to rise but that did not happen. So I just had to quit the game?
SPOILER
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One question to other people playing this game: Has anybody figured out what the cube is "saying"? I'm really bad at translating.